Design of an Airborne L-Band Cross-Track Scanning Scatterometer
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- Publication date
- 2002-09-18
- Usage
- Public Domain
- Topics
- ATS 3, SAGE SATELLITE, NASA PROGRAMS, BALLOON-BORNE INSTRUMENTS, VOLCANIC ERUPTIONS, RESCUE OPERATIONS, DISASTERS, SMOKE, PLUMES
- Collection
- nasa_techdocs
- Contributor
- NASA
- Language
- English
- Rights
- Public Domain
In this report, we describe the design of an airborne L-band cross-track scanning scatterometer suitable for airborne operation aboard the NASA P-3 aircraft. The scatterometer is being designed for joint operation with existing L-band radiometers developed by NASA for soil moisture and ocean salinity remote sensing. In addition, design tradeoffs for a space-based radar system have been considered, with particular attention given to antenna architectures suitable for sharing the antenna between the radar and radiometer. During this study, we investigated a number of imaging techniques, including the use of real and synthetic aperture processing in both the along track and cross-track dimensions. The architecture selected will permit a variety of beamforming algorithms to be implemented, although real aperture processing, with hardware beamforming, provides better sidelobe suppression than synthetic array processing and superior signal-to-noise performance. In our discussions with the staff of NASA GSFC, we arrived at an architecture that employs complete transmit/receive modules for each subarray. Amplitude and phase control at each of the transmit modules will allow a low-sidelobe transmit pattern to be generated over scan angles of /- 50 degrees. Each receiver module will include all electronics necessary to downconvert the received signal to an IF offset of 30 MHz where it will be digitized for further processing.
- Addeddate
- 2011-05-31 11:21:27
- Document-source
- CASI
- Documentid
- 20030004018
- Identifier
- nasa_techdoc_20030004018
- Identifier-ark
- ark:/13960/t1cj98w5s
- Nasa-center
- Goddard Space Flight Center
- Ocr
- ABBYY FineReader 8.0
- Online-source
- http://wayback.archive-it.org/1792/20100130203800/http://hdl.handle.net/2060/20030004018
- Original-nasa-rights
- Unclassified; No Copyright; Unlimited; Publicly available;
- Ppi
- 600
- Updated-added-to-ntrs
- 2007-06-21
- Year
- 2002
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